Welcome to the NewsHour.

Ahead of the President's address to Congress tonight, the White House is implementing two new policies with global consequences.

The Trump administration is halting military aid to Ukraine, and it's imposing new tariffs on Mexico, Canada, and China.

That sparked a wider trade war and sent markets plummeting for a second day in a row.

We start tonight with the economic fallout.

Hours after the new tariffs took effect, a blunt rebuke from America's second largest trading partner.

Even though you're a very smart guy, this is a very dumb thing to do.

Speaking directly to President Trump, Canadian Prime Minister Justin Trudeau announced

tariffs on more than $100 billion of U.S. exports in the coming weeks, a quarter of which

take effect immediately.

Canadians are reasonable and we are polite, but we will not back down from a fight.

Our tariffs will remain in place until the U.S. tariffs are withdrawn.

The new U.S. tariffs, in effect today, impose a 25% tax on imports from Canada and Mexico

and raise duties on Chinese goods to 20%.

It may well be short-term price movements, but in the long term, it's going to be completely

different.

Commerce Secretary Howard Lutnik defended the tariffs on CNBC and said they could be lifted

later on.

He argued today's policy is tied to the flow of fentanyl into the

U.S. from China and across the borders with Canada and Mexico. We need to see material reduction

in autopsy deaths from opioid, and that's what the president is talking about. This is not a trade war.

Trudeau said Canada has stepped up its efforts to control fentanyl

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